Abstract

A thermodynamic analysis is performed of the patterns of steam conversion of natural gas at temperatures of 300–600°C, pressures of 0.1–4 MPa and H₂O : C molar ratios of 0.8‒1.2. Under these conditions, the reaction product is methane–hydrogen mixtures with hydrogen concentrations of 10–30 vol %. A rise in temperature, molar ratio Н₂О : С, and a decrease in pressure contribute to an increase in the concentration of hydrogen in the reaction products. The thermodynamic boundaries of the process with no carbonization of the catalyst are determined. Experiments are performed to obtain methane–hydrogen mixtures from methane with an output concentration of 15–35 vol % hydrogen on industrial Ni-CrO_x-Al₂O₃ catalyst at 325–425°C, a H₂O : C molar ratio of 0.8–1.0, and atmospheric pressure. It is shown that under these conditions, the process proceeds without the formation of carbon on the catalyst.

中文翻译：

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天然气的低温蒸汽转化为甲烷-氢混合物

摘要

对天然气在300–600°C，0.1–4 MPa的压力和H ₂ O：C摩尔比为0.8到1.2的蒸汽转化模式进行热力学分析。在这些条件下，反应产物是甲烷与氢气的混合物，氢气浓度为10–30 vol％。在温度升高，摩尔比Н ₂ О：С，并且在压力的降低有助于增加在氢气中的反应产物的浓度。确定没有催化剂碳化的方法的热力学边界。进行了实验，以在工业Ni-CrO _x -Al ₂ O ₃上从甲烷中获得氢气浓度为15-35 vol％的甲烷-氢气混合物催化剂在325–425°C，H ₂ O：C摩尔比为0.8–1.0和大气压下进行。结果表明，在这些条件下，该方法进行时不会在催化剂上形成碳。